Wisconsin election

Waukesha County Clerk Kathy Nickolaus said the mistake was "human error, which I apologize for." Critics noted her Republican ties and called for an investigation.

Waukesha County Clerk Kathy Nickolaus said the mistake was "human error, which I apologize for." Critics noted her Republican ties and called for an investigation. (Michael Sears / Milwaukee Journal Sentinel)

Waukesha County Clerk Kathy Nickolaus said the mistake was "human error, which I apologize for." Critics noted her Republican ties and called for an investigation.